mirror of
https://github.com/SerenityOS/serenity
synced 2024-09-06 17:06:31 +00:00
157 lines
4.6 KiB
C++
157 lines
4.6 KiB
C++
/*
|
|
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
|
|
*
|
|
* SPDX-License-Identifier: BSD-2-Clause
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <AK/Badge.h>
|
|
#include <AK/Types.h>
|
|
#include <Kernel/Forward.h>
|
|
#include <Kernel/PhysicalAddress.h>
|
|
|
|
#include <AK/Platform.h>
|
|
|
|
namespace Kernel {
|
|
|
|
class PageDirectoryEntry {
|
|
public:
|
|
PhysicalPtr page_table_base() const { return PhysicalAddress::physical_page_base(m_raw); }
|
|
void set_page_table_base(u32 value)
|
|
{
|
|
m_raw &= 0x8000000000000fffULL;
|
|
m_raw |= PhysicalAddress::physical_page_base(value);
|
|
}
|
|
|
|
bool is_null() const { return m_raw == 0; }
|
|
void clear() { m_raw = 0; }
|
|
|
|
u64 raw() const { return m_raw; }
|
|
void copy_from(Badge<Memory::PageDirectory>, PageDirectoryEntry const& other) { m_raw = other.m_raw; }
|
|
|
|
enum Flags {
|
|
Present = 1 << 0,
|
|
ReadWrite = 1 << 1,
|
|
UserSupervisor = 1 << 2,
|
|
WriteThrough = 1 << 3,
|
|
CacheDisabled = 1 << 4,
|
|
Huge = 1 << 7,
|
|
Global = 1 << 8,
|
|
NoExecute = 0x8000000000000000ULL,
|
|
};
|
|
|
|
bool is_present() const { return (raw() & Present) == Present; }
|
|
void set_present(bool b) { set_bit(Present, b); }
|
|
|
|
bool is_user_allowed() const { return (raw() & UserSupervisor) == UserSupervisor; }
|
|
void set_user_allowed(bool b) { set_bit(UserSupervisor, b); }
|
|
|
|
bool is_huge() const { return (raw() & Huge) == Huge; }
|
|
void set_huge(bool b) { set_bit(Huge, b); }
|
|
|
|
bool is_writable() const { return (raw() & ReadWrite) == ReadWrite; }
|
|
void set_writable(bool b) { set_bit(ReadWrite, b); }
|
|
|
|
bool is_write_through() const { return (raw() & WriteThrough) == WriteThrough; }
|
|
void set_write_through(bool b) { set_bit(WriteThrough, b); }
|
|
|
|
bool is_cache_disabled() const { return (raw() & CacheDisabled) == CacheDisabled; }
|
|
void set_cache_disabled(bool b) { set_bit(CacheDisabled, b); }
|
|
|
|
bool is_global() const { return (raw() & Global) == Global; }
|
|
void set_global(bool b) { set_bit(Global, b); }
|
|
|
|
bool is_execute_disabled() const { return (raw() & NoExecute) == NoExecute; }
|
|
void set_execute_disabled(bool b) { set_bit(NoExecute, b); }
|
|
|
|
private:
|
|
void set_bit(u64 bit, bool value)
|
|
{
|
|
if (value)
|
|
m_raw |= bit;
|
|
else
|
|
m_raw &= ~bit;
|
|
}
|
|
|
|
u64 m_raw;
|
|
};
|
|
|
|
class PageTableEntry {
|
|
public:
|
|
PhysicalPtr physical_page_base() const { return PhysicalAddress::physical_page_base(m_raw); }
|
|
void set_physical_page_base(PhysicalPtr value)
|
|
{
|
|
// FIXME: IS THIS PLATFORM SPECIFIC?
|
|
m_raw &= 0x8000000000000fffULL;
|
|
m_raw |= PhysicalAddress::physical_page_base(value);
|
|
}
|
|
|
|
u64 raw() const { return m_raw; }
|
|
|
|
enum Flags {
|
|
Present = 1 << 0,
|
|
ReadWrite = 1 << 1,
|
|
UserSupervisor = 1 << 2,
|
|
WriteThrough = 1 << 3,
|
|
CacheDisabled = 1 << 4,
|
|
PAT = 1 << 7,
|
|
Global = 1 << 8,
|
|
NoExecute = 0x8000000000000000ULL,
|
|
};
|
|
|
|
bool is_present() const { return (raw() & Present) == Present; }
|
|
void set_present(bool b) { set_bit(Present, b); }
|
|
|
|
bool is_user_allowed() const { return (raw() & UserSupervisor) == UserSupervisor; }
|
|
void set_user_allowed(bool b) { set_bit(UserSupervisor, b); }
|
|
|
|
bool is_writable() const { return (raw() & ReadWrite) == ReadWrite; }
|
|
void set_writable(bool b) { set_bit(ReadWrite, b); }
|
|
|
|
bool is_write_through() const { return (raw() & WriteThrough) == WriteThrough; }
|
|
void set_write_through(bool b) { set_bit(WriteThrough, b); }
|
|
|
|
bool is_cache_disabled() const { return (raw() & CacheDisabled) == CacheDisabled; }
|
|
void set_cache_disabled(bool b) { set_bit(CacheDisabled, b); }
|
|
|
|
bool is_global() const { return (raw() & Global) == Global; }
|
|
void set_global(bool b) { set_bit(Global, b); }
|
|
|
|
bool is_execute_disabled() const { return (raw() & NoExecute) == NoExecute; }
|
|
void set_execute_disabled(bool b) { set_bit(NoExecute, b); }
|
|
|
|
bool is_pat() const { return (raw() & PAT) == PAT; }
|
|
void set_pat(bool b) { set_bit(PAT, b); }
|
|
|
|
bool is_null() const { return m_raw == 0; }
|
|
void clear() { m_raw = 0; }
|
|
|
|
private:
|
|
void set_bit(u64 bit, bool value)
|
|
{
|
|
if (value)
|
|
m_raw |= bit;
|
|
else
|
|
m_raw &= ~bit;
|
|
}
|
|
|
|
u64 m_raw;
|
|
};
|
|
|
|
static_assert(AssertSize<PageDirectoryEntry, 8>());
|
|
static_assert(AssertSize<PageTableEntry, 8>());
|
|
|
|
class PageDirectoryPointerTable {
|
|
public:
|
|
PageDirectoryEntry* directory(size_t index)
|
|
{
|
|
VERIFY(index <= (NumericLimits<size_t>::max() << 30));
|
|
return (PageDirectoryEntry*)(PhysicalAddress::physical_page_base(raw[index]));
|
|
}
|
|
|
|
u64 raw[512];
|
|
};
|
|
|
|
}
|